e olha que

Portuguese edit

Literally, “and look that” (the word "that" being a conjunction).

(idiomatic) "and mind you"! (used to introduce a difficulty, an obstacle that has been overcome, for emphasis on the final result)
Eu tirei uma nota excelente na prova. E olha que nem estudei tanto!
I got an excellent grade in the test. And mind you, I did not even study that hard!
(literally, “...And look that I did not even study that hard!”)